我有一个 html 和一个 CSS 文件，我将 body 标签的背景设置为 background-image: url(..);
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, shrink-to-fit=yes">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">
<!-- jQuery first, then Tether, then Bootstrap JS. -->
<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>
<link rel="stylesheet" href="public/css/coreStyleSheet.css">
<link rel="stylesheet" href="public/css/animate.css">
<script src="public/js/coreHomePage.js"></script>
<link rel="stylesheet" href="assests/font-awesome-4.7.0/css/font-awesome.min.css"> </head>
<body>
<nav class="navbar navbar-light animated fadeInLeft" style="background-color: #C0C0C0 ;">
<button class="navbar-toggler navbar-toggler-left" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="#navbarNav" aria-expanded="false" aria-label="Toggle navigation"><span class="lines"></span><span class="lines"></span><span class="lines"></span></button>
<h1 class="navbar-brand mb-0 move-header">NavBrand</h1>
<div class="collapse animated fadeInLeft" id="navbarNav">
<ul class="navbar-nav">
<li class="nav-item active"> <a class="nav-link" href="#">Home</a> </li>
<li class="nav-item"> <a class="nav-link" href="#">Features</a> </li>
<li class="nav-item"> <a class="nav-link" href="#">Pricing</a> </li>
<li class="nav-item"> <a class="nav-link disabled" href="#">Disabled</a> </li>
</ul>
</div>
</nav>
<div class="container">
<div class="row"></div>
</div>
</body>
</html>
CSS
body {
background-image: url(../../assests/img/back.jpg);
background-repeat: no-repeat;
background-size: cover;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
}
当我开始调整窗口大小时，真正的问题就开始了，当图像调整高度时，图像开始很好地调整大小，出现很多失真在图像中，图像的某些部分会移动，而某些部分会静止不动。我可以给你看，但我无法捕捉屏幕。但是当我在 JSFIDDLE 中运行时，它工作正常。我的代码中有媒体查询，它位于 body 标签之后。
PS:使用bootstrap4
最佳答案
在适当保留背景图像的同时调整窗口大小对我来说一直很有效，尤其是在使用 Bootstrap 时。
html {
background: url(../../assests/img/back.jpg) no-repeat center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
这会在调整窗口大小时固定背景并将其居中。
关于javascript - 调整图像大小以适应父 CSS/Bootstrap，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41770291/